import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:location/location.dart';

class GetLocationWidget extends StatefulWidget {
  const GetLocationWidget({Key key}) : super(key: key);

  @override
  _GetLocationState createState() => _GetLocationState();
}

class _GetLocationState extends State<GetLocationWidget> {
  final Location location = Location();

  LocationData _location;
  String _error;

  Future<void> _getLocation() async {
    setState(() {
      _error = null;
    });
    try {
      final LocationData _locationResult = await location.getLocation();
      setState(() {
        _location = _locationResult;
      });
    } on PlatformException catch (err) {
      setState(() {
        _error = err.code;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('定位'),
      ),
      body: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: <Widget>[
          Text(
            'Location: ' + (_error ?? '${_location ?? "unknown"}'),
            style: Theme.of(context).textTheme.body2,
          ),
          Row(
            children: <Widget>[
              RaisedButton(
                child: const Text('Get'),
                onPressed: _getLocation,
              )
            ],
          ),
        ],
      ),
    );
  }
}
